Study of the ring closure reaction of o-aminoarylsulfonamides with 1,1'- thiocarbonyldiimidazole

Article abstract of DOI:10.1016/S0040-4020(98)00195-1

1,1'-Thiocarbenyldiimidazole was used as a ring closure agent for o- aminoarylsulfonamides. Beside the formation of the expected 3-thioxo-2,3- dihydro-4H-1,2,4-arylthiadiazine 1,1-dioxide derivatives, a new kind of compound was also obtained, namely the 3